Mines of Fengfeng Group mostly adopted polyurethane sealing hole and cement mortar hole sealing to conduct drilling gas extraction. When extracting soft rock ( coal ) gas layer fracture zone, is with problems of  sealing quality,  low gas concentration, long pre-draining time, low extraction efficiency. By optimizing drilling hole sealing process, full hole with protective hole screen and two plug and one injection were adopted to seal hole and extend drilling effective extraction time, accelerate the process of the gas extraction face, with important significance to efficient use of drilling extraction, gas extraction and the mine safety production of Fengfeng Mine.